Diastereo- and Enantioselective Iridium Catalyzed Coupling of Vinyl Aziridines with Alcohols: Site-Selective Modification of Unprotected Diols and Synthesis of Substituted Piperidines
作者:Gang Wang、Jana Franke、Chinh Q. Ngo、Michael J. Krische
DOI:10.1021/jacs.5b04404
日期:2015.6.24
The chiral cyclometalated π-allyliridium ortho-C,O-benzoate complex (R)-Ir-VIb derived from [Ir(cod)Cl]2, allylacetate, 4-cyano-3-nitro-benzoic acid, and (R)-MeO-BIPHEP catalyzes the coupling of N-(p-nitrophenylsulfonyl) protected vinyl aziridine 3a with primaryalcohols 1a-1l to furnish branched products of C-C bond formation 4a-4l with good levels of anti-diastereo- and enantioselectivity. In the
Catalyst-Directed Diastereo- and Site-Selectivity in Successive Nucleophilic and Electrophilic Allylations of Chiral 1,3-Diols: Protecting-Group-Free Synthesis of Substituted Pyrans
作者:Inji Shin、Gang Wang、Michael J. Krische
DOI:10.1002/chem.201404065
日期:2014.10.6
The iridium‐catalyzed, protectinggroup‐free synthesis of 4‐hydroxy‐2,6‐cis‐ or trans‐pyrans through successive nucleophilic and electrophilic allylations of chiral 1,3‐diols occurs with complete levels of catalyst‐directed diastereoselectivity in the absence of protectinggroups, premetallated reagents, or discrete alcohol‐to‐aldehyde redox reactions.
Enantioselective synthesis of (R)- and (S)-2-methyl-4-octanol, the male-produced aggregation pheromone of Curculionidae species
作者:Patricia T. Baraldi、Paulo H.G. Zarbin、Paulo C. Vieira、Arlene G. Corrêa
DOI:10.1016/s0957-4166(02)00156-8
日期:2002.4
This work describes an enantioselective synthesis of (R)- and (S)-2-methyl-4-octanol, a compound that has been identified as the aggregationpheromone of some sugarcane weevils. (S)-2-Methyl-4-octanol was efficiently prepared in five steps and 20% overall yield, and its (R)-enantiomer, in six steps and 14% overall yield, both from commercial isovaleryl chloride. The key step of our synthetic route